Awesome news !!
I'm through the moon for you and Adam that his visual scores are so high!!
For what it's worth - As someone born with SSD myself (I was born with no hearing on my right and normal on my left ... the left slllooowyy started to become mild HL etc)
I'd also suggest pushing for a BAHA trial - even if "they" don't suggest it or even "ho-hum" the idea. He's still at the perfect age to really benefit from it and be able to develop an almost "natural" sense of "artificial stereo hearing" ... if that makes sense.
The trial BAHA is mounted on a head band which they wear for a period of weeks or months (heck technically years). and then if Adam benefits from it there is a 1 or 2 part minor surgery to mount the "screw" and then after it heals the BAHA aid just "clicks" in place.
BAHA is really a very very good option - one that I sort of wish existed when I was little ... at least to try.
I haven't really considered the idea of BAHA as an adult mainly because my audiologist & I both agree that the APD complicates things and also the quick in office test we did when I was about 25 to see if CROS (see below) would work for me ... ended up with me not being able to understand anything at all (the APD hard at work) . Keep in mind that not hearing anything at all for 30+years on the right side and APD makes a HUGE difference ... likely if I'd been fitted with a BAHA in my first 5 years the outcome would have been different.
I'm not sure what the status for coverage for BAHA surgery is ... I'm going to guess that it would be covered in the same manner as the CIs are - however I honestly have never really looked into it at all.
The other option is a CROS aid ... It works by having a HA in both ears, the one in the deaf side uses the mic to "listen" to the sounds on that side and then it (wired or wireless) sends those sounds to the "hearing side" into the HA ... that way you can hear both sides coming through the hearing side. Adams current HAs might actually be CROS compatible and just need to be "set into CROS mode". Honestly this option doesn't produce as good a "result" as the BAHA and means having two hearing aids again (along with the associated costs etc) - it is however an option.
Here are a few sites about BAHA :
http://www.umm.edu/otolaryngology/baha.htm
http://products.cochlearamericas.com/baha
If you'd like to chat about BAHA more send me a PM here ? I'd love to chat again anyway 
